I have no picture to share only a horror story of a customer who brought me a car to correct after one had been poorly installed.The A pillar wound up sagging down and then the rocker was installed so that the overall out of square was close to one inch!!!
I would suggest jigging up the inner and outer panels with the door set up as it will be when finished.then the floor will make little matter. Bear in mind that the door openings of a 4/6 are influenced a lot by the body shims at the out riggers vs the front or rears,but you have to be in the ball park,NOT the bleachers!!
MD(mad dog)